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Back from a weekend of racing where I was finally able to do some full ¼ mile runs. Nothing ground-breaking but I feel happy to finally have made it into the 11’s; best run was 11.9 and 122 mph with a 60ft time of 2.0 seconds. I have difficulties launching with my 6-speed and I probably need a lot more practice to lower the 60ft.
Anyway, my first run netted me a trap speed of 118,1 mph. This was with my old and probably quite restrictive K&N filter. Next run I replaced the filter with an air funnel (without any filter). Next run (30 minutes later) and without any other changes, the trap speed increased to 121.1 mph. I know that centrifugal blowers are sensitive to intake restrictions but I didn’t expect any noticeable difference so this was somewhat of a surprise-at least to me.
Anyway, my first run netted me a trap speed of 118,1 mph. This was with my old and probably quite restrictive K&N filter. Next run I replaced the filter with an air funnel (without any filter). Next run (30 minutes later) and without any other changes, the trap speed increased to 121.1 mph...
That is approximately a 35 horsepower difference w/out the filter. Good job.
Back from a weekend of racing where I was finally able to do some full ¼ mile runs. Nothing ground-breaking but I feel happy to finally have made it into the 11’s; best run was 11.9 and 122 mph with a 60ft time of 2.0 seconds. I have difficulties launching with my 6-speed and I probably need a lot more practice to lower the 60ft.
Anyway, my first run netted me a trap speed of 118,1 mph. This was with my old and probably quite restrictive K&N filter. Next run I replaced the filter with an air funnel (without any filter). Next run (30 minutes later) and without any other changes, the trap speed increased to 121.1 mph. I know that centrifugal blowers are sensitive to intake restrictions but I didn’t expect any noticeable difference so this was somewhat of a surprise-at least to me.
C4 ?
I had a tough time with the filter on mine as well.
Probably added some boost too. Did you log any runs to see if boost increased?
Good results! I miss Sweden. Spent a lot of time in Kiruna.
Considering the C6 ZR1's were trapping around 128mphs (including one with a Lingenfelter 710hp package) I think 122 mph was ok-managed to surprise a few C6/7's owners with my old L98 ;-)
Never been to Kiruna (about 1200 miles north of me...) but I´ve heard its a beautiful place, especially during summer (its North of the Arctic circle and its pitch black around the clock at wintertime).
Logged all runs - boost increased 0.9 psi without the filter.
Thanks for sharing!! Great result. So what is thing you fitted? Is it a filter in any way?
The funnel is empty and there´s no filter. Like this: http://www.dragzine.com/tech-stories...uth-air-inlet/
Occational 1/4 mile blasts will probably be ok but I dont Think its a good idea to use it permanently. No intercooler, only meth injection (well actually "Eth injection" since I use ethanol/water 50/50).
Yeah usually no filter helps abit but depends on size obviously. With something limited in space there that makes sense
Could get a mesh screen type cover (turboguard) but running filter on street is highly advisable lol
I dont know if it was the bellmouth or the lack of filter that gave me the power increase but these two items looks like they can be combined and give a nice smooth entry with a decent filter element:
I dont know if it was the bellmouth or the lack of filter that gave me the power increase but these two items looks like they can be combined and give a nice smooth entry with a decent filter element:
My air filter is close to the driver side manifold but I understand once you get some speed, hot air will be vented out (its a C4 Corvette, don't know if the same apply to a thirdgen though)
I still think shielding the blower and the air filter from the heat of the header is wortwhile- I have got some fancy insulation material I will try to apply: http://www.aerogel.com/products-and-.../pyrogel-xt-e/
Maybe off topic but anyway....it seems like my air filter is not the only restriction. Measured exhaust back pressure today (at the passenger side collector and before the cat) and it reached 8,5 psi at WOT/6200rpms. I will probably replace the cat(s) with a piece of straight pipe.
Im gonna chime in on the opposite end of this spectrum - Recently put a CIA on mine to get it away from the header heat - The car runs much better, the IAT's are much lower, and its more consistant interms of AFR and ambient temp now, But i noticed im losing about 1.5-2PSI of boost, which i assume is from the 3.5" ID tubing ive got now relocating the filter. Might try shortening it up some. I wanna do a second log tomorrow, as i got cut short tonight by a cop sitting at the light by my house
The car runs much better, the IAT's are much lower, and its more consistant interms of AFR and ambient temp now, But i noticed im losing about 1.5-2PSI of boost,
Interesting, I wonder of you will be able to gain some power since you might be able to put in some more advance (to negate the loss of boost)?
Again, coming the C4 World it seems difficult to come up with a good solution for the air filter. I have pasted some old stuff from the manufaturer of my blower kit that might apply to a thirdgen as well:
"Many, many years ago when we first developed the C4 L98 S/C kit we placed a temp probe inside the blower air filter where it sat above the headers. At a hot idle sitting still yes the air got hot BUT as soon as the car started moving there was very little difference between the OAT and the temp inside the air filter. AND because the centrifugal blower is so sensitive to air inlet restrictions we found a loss of power when remoting the air filter to the battery location (after relocating battery of course). The best method of a cold air inlet I have seen is the air filter on the blower with an appropriate hood opening and box beneath the filter as seen in one of the pics here."
Maybe off topic but anyway....it seems like my air filter is not the only restriction. Measured exhaust back pressure today (at the passenger side collector and before the cat) and it reached 8,5 psi at WOT/6200rpms. I will probably replace the cat(s) with a piece of straight pipe.
This is what 8,5 psi exhaust back pressure looks like
Left cat-exit side, the substrate completly loose inside the casing
I gutted the CATS. I never tracked the car with the CATS in that shape (it was that way when I purchased the car). For sure though, it idled much better once I fixed the problem!
I don't have cats on my vehicle either, but 1) you shouldn't be insulting people based on their sexual orientation, and 2) with a laundry list like this you should be more concerned about fixing your car than giving advice to others:
So you delet my post because you don't like the truth. What you should have done was delete your post because you don't know what your talking about.
Let me be perfectly clear.
This thread is discussing intake and exhaust restrictions on his hot rod. It is both inappropriate and against the rules to make insults regarding sexual orientation on this forum.
Again, I highly and politely suggest you focus your concentration on repairing the unsafe vehicle outlined in the report by a reputable shop, rather than insulting members with off topic and absurd statements.
Debating tech is perfectly fine. Your behavior in numerous threads has been unacceptable. I won't discuss this any further.
08-15-2016, 03:13 PM
